DOUG S HEADERS D319 2 1 Installation guide

D319 2 1
Brand
DOUG S HEADERS
Model
D319 2 1
Type
Installation guide

This manual is also suitable for

Installation Instructions & Warranty Information
D319 ~ 1967-1969 CHEVY Camaro / 68-74 Nova/Chevy II
1967-69 Pontiac Firebird
396-502 Big Block (Std. Deck Height Only)
Long Tube Headers
REV. 6 5-9-22 DSL
1967 Camaro Only
1968-74 Models
NOTE: These are a large 2 1/8” header primarily designed for racing and as such are not
recommended for cars with comfort options. They are a tight t and tougher to install then
smaller tube versions available from Doug’s.
NOTE: Vehicles MUST have Original Style Big Block motor stands and motor mounts for
Headers to t properly. They are no longer available from G.M., but reproductions are
available from most of the Camaro & Nova specialty suppliers. If the motor is mounted on
Small Block frame mounts, you will notice possible Steering Box, Frame, and Idler Arm t
problems.
DISASSEMBLY
1. Remove and mark all spark plug wires and then remove all spark plugs.
2. RemovetheOillter,ClutchLinkage,Columnshiftautotranslinkage,OildipstickTube,
 Starter,andAirConditioningCompressor.1969Carswithshifter/keyinterlocksystemwillhave
to be removed and disabled.
3. Disconnecttheheadpipesfromtheexhaustmanifoldsandremovethemanifolds
4. Remove the gaskets and any gasket material or any carbon deposits that remain on the head
 surface.
INSTALLATION
1. Placeajackundertheoilpan,withablockofwoodtopreventdamagetothepan.Loosenthe
rear transmission mount bolts. Remove the Driver’s side motor mount bolt and nut.
2. Raisetheleftsideoftheengineapproximately1”to11/2”.
3. Startingfrombelow,worktheDriver’ssideheaderupintoposition.Startaboltoneachendof
 theheadertoholdinplace.Donotfullytightenatthistime.
4. Lowertheenginebackintopositionandreplacethemountboltandnutandfullytightenthem.
Retighten the transmission bolts.
5. Withtheheaderstillloose,worktheclutchorautomaticshiftercrossshaftbetweentheL3and
L4 tubes and into position.
6. Reinstallandfullytightenalllinkagesandtheoillter.
7. Sliptheexhaustgasketintoplaceandstartalltheheaderboltsbyhand.
8. Tighten all the bolts evenly starting in the center and working your way out.
9. Frombelow,workthePassengersideheaderintoposition.Startaboltoneachendofthe
 headertoholdinplace.Donotfullytightenatthistime.
10. Re install the starter motor.
11. Sliptheexhaustgasketintoplaceandstartalltheheaderboltsbyhand.
12. Tighten all the bolts evenly starting in the center and working your way out.
13. Doug’sdoesnotrecommendA/Cwiththisheader,butAirConditionedcarswillrequirethe
 modicationtothebracketasshowninIllustrationA.
14. Install the oil dipstick tube.
15. Installthereducersusingthesuppliedbolts,washers,nutsandgaskets.
16. Weldtheexhaustsystemtothereducers.
17. Install the spark plugs and connect the wires to the proper plug.
18. Checktomakesurethatallthewiring,fuellines,transmissioncoolerlines,brakelines,
 hoses,etc.areclearoftheheadersoranyexhaustcomponentsandrerouteorrelocatethose
components as necessary.
19. Check the oil level.
20. Connect the battery cable.
Illustration A; Air conditioning Bracket.
Parts List
1 LeftSideHeader    1 RightSideHeader
2 HeaderGaskets    2 3½”Reducers
2 3½”,3BoltCollectorGaskets  16 3/8”-16X1”HeaderBolts
6 3/8”-16X1¼”HexHeadCapScrews 6 3/8”-16HexNuts
223/8”Lock-Washers    2 Doug’sStickers
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DOUG S HEADERS D319 2 1 Installation guide

D319 2 1
Brand
DOUG S HEADERS
Model
D319 2 1
Type
Installation guide
This manual is also suitable for
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